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Yesterday I noticed that my preferred HUD setting--show MPH and water temp but no RPM--didn't come up, instead I got the default with everything (MPH, temp, and RPM). I set up my preferences again but in the last 5 starts, the default came up 3 times instead of my settings.
I have a 1-year-old Optima that reads 12V with the key in the ON position, so I don't think it's the battery. Also, all the other things that have to retain settings while the car is off (radio stations, various things in the DIC) seem to be OK.